drm/i915: s/intel_gen4_compute_page_offset/intel_compute_tile_offset/

Since intel_gen4_compute_page_offset() can now handle tiling formats
all the way down to gen2, rename it to intel_compute_tile_offset().
Not that we actually use it on gen2/3 since there's no DSPSURF etc.
registers which would take a page aligned address.

v2: s/page/tile/ (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452625717-9713-7-git-send-email-ville.syrjala@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 64083d7..22589fc 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -423,10 +423,10 @@
 	crtc_h--;
 
 	linear_offset = y * fb->pitches[0] + x * pixel_size;
-	sprsurf_offset = intel_gen4_compute_page_offset(dev_priv, &x, &y,
-							fb->modifier[0],
-							pixel_size,
-							fb->pitches[0]);
+	sprsurf_offset = intel_compute_tile_offset(dev_priv, &x, &y,
+						   fb->modifier[0],
+						   pixel_size,
+						   fb->pitches[0]);
 	linear_offset -= sprsurf_offset;
 
 	if (plane_state->base.rotation == BIT(DRM_ROTATE_180)) {
@@ -557,10 +557,10 @@
 		sprscale = SPRITE_SCALE_ENABLE | (src_w << 16) | src_h;
 
 	linear_offset = y * fb->pitches[0] + x * pixel_size;
-	sprsurf_offset = intel_gen4_compute_page_offset(dev_priv, &x, &y,
-							fb->modifier[0],
-							pixel_size,
-							fb->pitches[0]);
+	sprsurf_offset = intel_compute_tile_offset(dev_priv, &x, &y,
+						   fb->modifier[0],
+						   pixel_size,
+						   fb->pitches[0]);
 	linear_offset -= sprsurf_offset;
 
 	if (plane_state->base.rotation == BIT(DRM_ROTATE_180)) {
@@ -696,10 +696,10 @@
 		dvsscale = DVS_SCALE_ENABLE | (src_w << 16) | src_h;
 
 	linear_offset = y * fb->pitches[0] + x * pixel_size;
-	dvssurf_offset = intel_gen4_compute_page_offset(dev_priv, &x, &y,
-							fb->modifier[0],
-							pixel_size,
-							fb->pitches[0]);
+	dvssurf_offset = intel_compute_tile_offset(dev_priv, &x, &y,
+						   fb->modifier[0],
+						   pixel_size,
+						   fb->pitches[0]);
 	linear_offset -= dvssurf_offset;
 
 	if (plane_state->base.rotation == BIT(DRM_ROTATE_180)) {